Technical description and composition of the MYSTERY MTV-4203WH TV, type of panel and applicable modules. The composition of the modules.MYSTERY
Model: MTV-4203WH
Panel: T420HW02 V0
Power Supply (PSU): MLT198L REV: 1.3
PWM Power: MC0628R, NCP1653A (PFC), LD7550 (6pin)
MainBoard: MHDV4201-ZC01-01 (B)
IC MainBoard: ZR39162PQCG, HY5DU281622FTP-4, Winb25X40, 24C64
Tuner: TDFC-G101D
Technical Specifications MTV-4203WH
MYSTERY MTV-4203WH
General recommendations for repairing TV LCD
Repair of the MYSTERY MTV-4203WH TV is best started with a thorough external inspection and troubleshooting. It is advisable to carefully examine the internal and external components. Any external damage can sometimes prompt the repairman to take further steps to determine the malfunction of the TV and localize the defect. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
If the MYSTERY MTV-4203WH does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a power module malfunction. It is advisable to start the troubleshooting of the power supply module by checking the mains fuse. If it is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and the power switch of the converter, which are often found in breakdown conditions in such situations.
It should be borne in mind that in the repair practice it is extremely rare that key transistors of the N-FET type fail for no reason that should be looked for by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, either dried electrolytic capacitors or dangling resistors of the primary circuit of the PSU, involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
When using a power factor correction unit (PFC) in the power modules, troubleshooting becomes somewhat more complicated and requires additional experience and knowledge of their operation.
Sometimes the MYSTERY MTV-4203WH TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including in the power supply unit (power supply unit).
Diagnostics and repair of the inverter are often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any emergency situation, for example, when the lamps are worn or depressurized. Often, to localize a defect, its blocking is required.
In such cases, special care should be taken during diagnostics, and after completion of all repair work it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
When repairing an MB board, you need to check its components MHDV4201-ZC01-01 (B), Winb25X40, 24C64. Defective items should be replaced.
It should be remembered! Attempts to repair the MYSTERY MTV-4203WH TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> MLT198L
The appearance of the MainBoard MHDV4201-ZC01-01 is shown in the figure below:MHDV4201-ZC01-01
PSU Advanced
The MTV-4203WH is equipped with an MLT198L power supply module using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the NCP1653A PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes when the charge current determines its reactance (about 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the MYSTERY MTV-4203WH device:
Installed matrix (LCD panel) T420HW02 V0.
The required supply voltages for all nodes of the MYSTERY MTV-4203WH TV are generated by the MLT198L power supply module or its analogs using microchips MC0628R, NCP1653A (PFC), LD7550 (6pin).
MainBoard - the main board (motherboard) is an MHDV4201-ZC01-01 module, using microchips ZR39162PQCG, HY5DU281622FTP-4, Winb25X40, 24C64 and others.
The TDFC-G101D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T420HW02 V0
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 2500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 15/5 (Tr / Td); 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 18 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
MYSTERY MTV-4203WH TV with T420HW02 LCD display, diagonal size 42 "(106 cm) in 16: 9 format. Screen brightness of 500 cd / m² is ensured by backlighting with CCFL (EEFL) fluorescent lamps. Contrast, as the ratio of maximum brightness to minimum, is 1500: 1. The design and technical capabilities of the TV provide for viewing broadcasts and films in high quality HD with a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Grafic Digital signal processing and generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the sound system 24 W (2x12 W). The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV x2, audio x3, S-Video x2, component, SCART x2, VGA, HDMI x2. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
The power consumed by the TV in the operating mode from the network is 300 watts.
Dimensions: With stand 642x444x209 mm, Without stand 570x345x70 mm.
Attention! The T420HW02 V0 panel of the MYSTERY MTV-4203WH LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!